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W. A. GAY.

Gravel Heater.

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ntcd tatw WILLIAM A. GAY. OF NEWARK, NEW JERSEY.

Letters Patent No. 99,077, dated J amcary 25, 18,70.

GRAVEL-HEATBR The Schedule referred to in these Lettera Patent and making part of the same.

To all whom it may concer'n:

Be it known that I, WILLIAM A. GAY, of N cwark,

in the county'of Essex, and State of New Jersey,

have inventeda new and useful Improvement in Gravel- Heater; and I do hereby declare that the following is a full, clear, and exact description thereof, Which Willl enable others skilled fliu the art to make and use thel same, reference being had to the a'ccompanyiug draw- V ings, forming part of this specification.

It consists in the construction and arrangernent hereinafter described.

In the accompanying drawing- Figure l is a vertical longitudinal section of fig. 2, through the line x x.

Figure 2 is a top or plan view. o

Figure 3 is a vertical cross-section through the liney y of fig. 2.

Similar' letters of reference indicate corresponding parts.

This apparatus consists of a rectangular-shaped casing, A, of suitable size, (in length, breadth, and depth.) With an interiorflarrangement of inclined and vertical plates, for enclosing the fire and conveyiug the heat to the gravel, with interior guide-fianges and dischar'geapertures for the gravel.

The casing A is open at top and bottom, the fire being made or supported on the ground.

B is the furnace-door;

O, the fire-chamber; and

D,-the combustion-chamber, the sides of Which may be perforated, as seen in fig. 1, at i.

The whole apparatus is made of sheet-metal, preferably, and the sides of the combustion-chamber Dare perforated, by means of punching from the inner sides of those plates, which leaves their outer sides with projecting collars around each hole, as on the surface of the Ordinary grates, Which prevent the particles of gravel from readily entering holes.

E represents the space Which is occupied by the gravel, when it is being hcated.

F is the pipe, for the discharge of the smoke.

G is a damper in the smoke-pipe.

H H represent the apertures, for the discharge of .the gravel. These apertures are narrow openiugs, exteuding the whole length of the apparatus on each side.

I I represent flanges ou the insides of the casing or I side walls, the tendency of which is to guide the gravel on to the inclined furnacc-plates J J.

The gravel to be heated is introduced at the top. A portion of the gravel will at first pass through the discharge-aperturcs H, and bank up, but as those ap'- ertures are near the ground, they will soon be filled, and then the gravcl will iill the space E, ou each side of the combnston-chamber. l

The gravel which rests over the plates J will soon become heated. The small banks of gravel at the sides are shovelled back into the heater, and the heated gravel, ready for use, will slide from the plates J, and be discharged.

The flanges I serve to Ithrow the desceuding gravei infxathin layer on to the hot plates J, so that when the gravel is discharged at H, it is thoroughly heated.

The perforat-ions i, through the sides of the combustion-chamber D, allow the heat to penetrate the mass of gravel iu the spaces E.

It will be seen that as the gravel is fed in at the top, the mass is .constantly settling and being discharged. This lheater being made of sheet-metal is light and portable. The large heating-surfitce exposed, and the inanner in which the gravei is projected upon 'the heated furnace-platcs, renders it economical of fuel, and admirably adapted for the purposes intended.

'By closing (or nearly closing) the damper G, after the fire is once well going,lthe combustion may be continued, and the main portion of the heat retained for a long thne.

I do not coufine myself to any particular size or positionfor the guide-fianges I, nor to perforating the sides of the combustion-chamber D.

Having thus described my invention,

I claiin as new, and desire to secure .by Letters Patent- 1. In combination with an apparatus for hcating gravel, the fire-chamber O and the combustion-chamber D, either Wit-h or without the perforation i, arranged substantially as described.

2, The flanges I, substantially as and for vthe purposes described.

3.. The combination of the heating-plates J J, the guide-fianges I, and the dischargc-apertures H, substantially for the purposes described.

The above specification of my inventiou signed by me, this 23d day ofNovcmber, 1869.

WM. A. GAY. Witncsscs:

Gno. W. Manha, ALEX. F. ltonnn'rs. 

